07/15/2004 Env Bd Packet - Laserfiche WebLink

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• • The design in the EAW described an abutment at each end and one pier in the middle, with trusses for support. The latest proposed bridge design includes five piers in the water and an abutment at each end. It will be approximately 22 feet wide. The bottom of the beam in the center of the bridge will be at an elevation of 890.4. The top of the road surface will be 893.6. The rail will be about two feet higher, at about 895.6. The center of the bridge will be approximately two feet higher than the ends, due to the slight arc of the design. The top of the rail will be approximately 13 feet above the level of the base of the vegetation, or ground level. If the vegetation grows four feet tall, the top of the bridge would be nine feet above the tops of the vegetation. The rails will be wood or steel, but the City could require wood to fit in with the wooded area. The bridge supports, or piles, will be 10 " -12" pipes covered with concrete. The sanitary sewer and water facilities proposed to run under the bridge would be designed according to all minimum engineering requirements. Such facilities running under bridges is not unique. The actual design would be part of the engineering review of the project, just as the they would be on any development. Linear Project: "Linear projects" in the EAW Guidelines is referring to such projects as highways, petroleum pipelines, large trunk or interceptor sewer lines, and other large projects that are fundamentally linear in nature As stated in the EAW, the total area of the property involved in the proposed project is 30.7 acres. The new cul de sac at the end of Ruffed Grouse Road would be extend about 150 feet to the bridge. The bridge would be about 300 feet long. The road on the island would be about 720 feet long. Fill: Construction of the roads, especially the road on the island, will require a significant amount of fill. The bridge abutments are proposed to be out of the wetlands. Dewatering: Typically, barriers are put in place around the location to be dewatered. Water is then pumped out of the inside of the barriers. Then the construction occurs in the dewatered area. Some water will seep in through the barriers, so a pump runs continually. The City would require that a small, temporary noise wall be constructed around any dewatering pump that will run after daytime working hours. Standard Requirements: As stated in the EAW, the project includes numerous unusual physical aspects. Standard zoning and subdivision requirements of the City's ordinances would not allow the project as proposed. Shoreland setbacks cannot be met, private roads are not normally allowed, the private road is in the shore impact area, and the road will extend a cul de sac that already exceeds the maximum length of 500 feet. Fauna: Item 15 refers to surface water use, i.e., boats, and their impacts on wildlife. The only likely watercraft from the proposed project would be canoes. Impacts of development on the island is addressed in Item 11, including means of minimizing impacts on Blanding's turtles. Solid Waste: The pipe under the bridge would carry sanitary sewer wastewater. This is not "solid waste ". Solid waste is such things as household trash, feedlot manure, treatment plant sludge, and incinerator ash. Only typical construction waste will be produced during DRAFT July 1, 2004 Pheasant Hills Preserve 12th Addn. EAW Record of Decision page 12